Radio control device



A. SPGTTEL Feb. 23, 1937.

RADIO CONTROL DEVICE Filed Feb. '7, 1935 INVENTOR.

4001/ -8 /07' 7Z2 X ap u.

ATTORNEY.

Patented Feb. 23, 1937 2,071,774

RADIO CONTROL DEVICE Adolf Spiittel, Berlin, Germany, assignor to Telefunken Gesellschaft fiir Drahtlose Telegraphic m. b. H., Berlin, Germany, a corporation of Germany Applieation February 7, 1935, Serial No. 5,377 In Germany February 7, 1934 Claims. (Cl. 250-40) Scale arrangements are known in which the out from the outside. The arrangement is such printed station names are arranged in accordance that the condenser is thereby drawn into one of with certain viewpoints, for instance according its end positions. to the alphabet, or to the respective country, A movement of the pointer with the plate 8 is but they are not arranged in accordance with not prevented by this tensioning of the rope, in 5 their transmitter frequencies. Marking points are spite thereof the pointer 1 can be moved in front assigned to these station names by which the of the scale 6. On the other hand, the tension of tuning is indicated. The tuning therefore is carthe rope 3 will not be changed by the movement of ried out in such a manner that the desired station the pointer l. is looked up in the station list which by means A second rope which extends across suitable of the arrangement above mentioned can be easily guide rollers i5 and rotates a disk I6 is connected accomplished, whereafter the tuning knob is to to plate 8, The disk I6 is so constructed that be turned until the tuning to the respective stait presents radially directed notches of various tion is indicated. Hereby it may rather easily depths. The entire arrangement is such that the happen that this marking be overlooked and that part 5 cooperates with the notches in such a way 5 the tuning means must be moved several times that a movement of the part 5 towards the right back and forth before the accomplished tuning is is prevented up to the end position by the base recognized. of the notches in the disk 16. The notches have In accordance with the invention these difsuch a depth that the variable condenser will be ficulties are overcome in that a full automatic just retracted by the spring I3 into the position tuning is provided in such a manner that simply of tuning of the station indicated by the pointer I. the bringing into coincidence of apointer movable 2 WS u t e detai s. H rein I is the in front of the station table with the respective front wall of the receiver casing having a 8101? I8 station name effects the tuning. For a b tt therein. Through this slot there reaches an arm derstanding of the invention reference is made to l9 Secured to the disk 8 and a further lever 20 35 the accompanying drawing, in which; pivoted at 2| to the disk 8 and having at its Fig. 1 is a front view, partly diagrammatic, of other end a circular rack or toothed portion 22. one embodiment of the invention and This rack 22 cooperates with a gear 23 fixedly Fig. 2 is an enlarged view of an adjustable slide secured to the lever H. The scale is to be conemployed and its cooperating adjusting memb r sidered as positioned alongside the slot I8, and the Fig. 1 of the accompanying drawing shows an P01111161 7 -S O t e Sa d Scale. example of a construction of the setting arrange- The device s arranged n Su h manner that the ment in accordance with the invention. Herein plate 8 w th th p t t e a y be m v d 6 is the shaft on which the tuning means is mountwhen the lever 20 is pressed downwards so that ed. In the present case it is a variable condenser, the rope 3 is tensioned by the lever I l. Hence the On shaft I a rope drum 2 is likewise fixedly stop 5 is drawn towards the left and consequently mounted over which a rope 3 leads across various no longer in contact with the disk 16. Now by guide rollers to a fixed point 4 of the receiver moving the pointer l by means of the arm IS the chassis. A part 5, for instance a pin, is fixedly said pointer can be brought into coincidence with secured to rope 3. 6 designates a table of station the desired station name, whereby at the same 0 names over which a pointer 1 moves. This pointer time the disk 16 will be so turned that a correis fastened to a plate 8 and can be moved therespondingly deep notch will be opposite the stop with from the outside. The plate 8 carries four 5. Upon releasing the lever 20 the stop 5 will be rollers 9 between which the rope 3 passes with moved up to the bottom of the notch and thus two parallel pieces of a loop formed by suitable permit a displacement of the tuning means by 5 guiding by means of rollers It]. In the center of means of the spring l3 to the desired tuning the disk 8 a lever H is rotatably mounted and position. whose ends carry rollers l2. The lever is so A Vernier or more accurate setting can be obformed that it does not touch the rope 3 in the tained by means of a fine adjustment. To this position shown, while when turn at 90 from end an eccentrically mounted disk 24 may serve, this position it laterally deviates the rope as and which bends out inalateral direction therope shown by the dash line. The rope 3 will therefore 3 between the guide rollers 25. be shortened and will be wound off the rope The figures simply serve as an example and to drum 2 against the action of spring l3, by a roelucidate the inventive idea. The construction tation of lever H which likewise can be carried may obviously deviate in many points from that 55 described. Thus for instance, the tensioning of the spring 13 may be obtained by a displacement of the point 4 or of the roller IE! with respect to the chassis. The disk It is not required to be rotatably mounted, it may have a rectangular shape and then be displaced by the rope I4.

I claim:

1. Means for adjusting a tuning device comprising in combination, means for rotating said device to an end position in one direction, a flexible member secured to said device one end of said flexible member being fixed, means for moving an intermediate portion of said flexible member to rotate said device in the opposite direction, a stop member connected to said flexible member, and an adjustable member having a plurality of projecting portions of difierent lengths arranged to engage said stop member.

2. Means for adjusting a tuning device to a tuning position comprising the combination of a scale, a pointer movable along said scale, means for rotating said tuning device in one direction, a stop member consisting of a flat disc having a plurality of substantially radially arranged notches of different depths, means connecting said stop member and pointer, and means for rotating said tuning device in the opposite direction to the tuning position comprising a flexible member having a portion arranged to engage the different notched portions of said stop member.

3. A device according to claim 2 in which said flexible member extends past said pointer and has one end secured in fixed position and a rotatable member mounted adjacent said pointer adapted to engage and bend said flexible member.

4. Means for adjusting a tuning device comprising the combination of a scale, a slide, a pointer secured to said slide and movable along said scale, means for rotating said tuning device in one direction, an adjustable stop member, a flexible member connected to said tuning device to rotate it in the opposite direction, a stop carried by said flexible member and engageable with said stop member, a member mounted on said slide and arranged to actuate said flexible member and a Vernier adjusting member mounted between said tuning device and stop member arranged to engage and bend said flexible member.

5. Means for adjusting a tuning device comprising the combination of a panel having a slot therein, a slide positioned behind said panel and having a handle portion projecting through said slot, means for rotating said tuning device in one direction and means for rotating said device in the opposite direction comprising a flexible memher having one end connected to said device and its other end secured in a fixed position, said flexible member having spaced apart parallel portions adjacent said slide, a member pivoted to said slide and arranged to flex at least one of said parallel portions and a control member projecting through said slot and connected to actuate said pivoted member.

ADOLF SPGTTEL. 

